Blower



E. MATHIS BLOWER Dec. 6, 1932.

Filed Sept. 5, 1952 2 Sheets-Sheet l Dec. 6, 1932. E, H 1,890,226

BLOWER Filed Sept. 3, 1952 2 Sheets-Sheet 2 Patented Dec. 6, 1932 UNITED STATES PATENT OFFICE IUC'm THIS, OF CHICAGO, ILLINOIS, ASSIGNOB TO NEW YORK BLOWER COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION 01 INDIANA BLOWER.

Qrlglnal application filed December 81, 1931, Serial No. 584,102. Divided and this application filed September 3, 1932.

This invention relates to a fan, and is a division of my applicationv Serial No. 584,102, filed December 31, 1931, now Patent No. 1,876,518. v

It has for one object to provide a fan in which the component parts are so shaped as to act as spacing and guiding members for manufacture, during the processof assembling. Another ob ect is to provide a fan in which the blades are themselves so shaped as to provide a positive engagement with the supporting parts. Another object is to provide such blades and to provide such positive engagement during the process of assembling and before the completion of manufacture.

Other objects will appear from time to time in the specification and claims.

My invention is illustrated more or less diagrammatically in the accompanying drawings, wherein Figure 1 is a side elevation of a partially completed fan, with parts broken away and parts in section;

Figure 2 is a transverse cross section,

en at line 2-2 of Figure 1;

Figure 3 is a fragmentary end elevation of the outer ring of the completed fan;

tak-

Figure 4 is a transverse cross-sectional detail taken on an enlarged scale, at line 4-4 of Figure 2;

Figure 5 is a cross-sectional detail taken on an enlarged scale at lines 55 of Figures 1 and 2;

Figure 6 is a side elevation of one of the blades in assembling position, showing its relation to the rings or other parts which it engages;

Figure 7 is a sectional detail on an enlarged scale, taken at line 7-7 of Figure 1; and

Figure 8 is a side elevation of a blade, shown separately.

Like parts are designated by like characters throughout the specification and drawmgs.

A is a hub which may have one or more set screws A by means of which the hub is held in fixed position upon a shaft A. The hub is preferably provided with an outwardly and laterally flared web A. In the form here shown, the web terminates at its outer edge in Serial No. 631,706.

a flat-sided annular portion A which may be shaped along one side to provide a de ression as at A. Preferably, also, the annu ar pors tion A extends laterally beyond the outer end of tl21e hub proper, as indicated at X in Figure Positioned upon the annular portion A and resting partially in the de ression A is a ring B- It may be secured to t e annulus A, for example by rivets B. It is preferably laterally bent so that its outer portion B lies generally in the same plane as the outer surface of the annulus A. A plurality of slots 13 is cut or otherwise formed in the flat outer portion B of the ring B, as indicated generally in Figure 1 and in detail in Figure 4. B is an annular corrugation.

C is an outer ring. It is preferably shaped and positioned so that its surface lies at an angle of approximately 45 with respect to the surface of the fiat portion B of the inner ring. It is also provided with slots C which correspond to the slots B of the inner ring B, one slot C being normally placed opposite each slot- B". This relation is brought out particularly in the showing of Fi ure 5.

f) is ablade which is preferably arcuate in cross section as shown particularly in Figures 1, 3 and 4. Any suitable number of these blades may be used, the number depending upon the size and type of the fan. The blade is preferably generally square across one end as shown particularly in Figures 6 to 8, inclusive, and the plane of its opposite end is preferably turned at an angle of approximately 45 with respect to the plane of the square end. Each blade D is provided at its inner or square end with a pair of laterally extending lugs D D which extend outward at approximately a right angle with respect to the longitudinal axis of the blade. These lugs, in the assembled fan, contact the inner surface of the flattened portion B of tin; inner ring. The squared end of each b ade is preferably provided with an additionallug D which may be situated between the two lugs D and is arranged to be bent parallel to them but offset from them a distance approximately equal to the thickness of the flatend. This end of each blade is also. provided with an additional lug D one of which may be positioned intermediate each pair of lugs D". In the assembled fan, the lugs D are bent laterally to lie in a plane parallel to that of the lugs D but preferably offset from them a distance approximately equal to the thick ness of the ring C. This is illustrated generally in Figure 2 and in greater detail in Figures 6 and 7. In the assembled fan the lugs D and D are bent as shown generally in Figures 1 to 5, inclusive and in detail in Fi ure 6, and thus engage each of the rings.

lifter the lugs have been bent into this position, they are permanentlysecured to the rings by welding, brazing or by soldering or otherwise." Iff th'e form shown, the lugs are soldered as at E.

It will be realized that whereas I have herewith shown and described a practical operative device, nevertheless many changes might be made in the size, shape, number and dispositionof parts, without departing from the spirit of my invention and I wish, therefore, that my showing be taken as in a sense diagrammatic.

The use and operation of my invention are as follows:

The fan of this invention may be used in a variety of associations where fans are desirable. Ordinarily two fans will be mounted together on a single shaft. Where that is done, they are made as rights and lefts and thus another fan similar to that shown in the drawings will be mounted to the right of the fan shown in Figure 2 on the shaft A and would be reversed with respect to it so that as the two rotate together, they discharge air in the same direction and work together in balanced relation.

Such fans are ordinarily mounted in a housing or casing. The air is drawn in through one side of the fan and discharged peripherally by centrifugal force. The particular form of easing or association in which the fan is used forms no particular part of the present invention. Such fans, however, are frequently used as ventilating fans although their use is not limitedto this.

The method of manufacturing this fan is generally as follows: The hub is manufactured by casting or otherwise, and is perforated so that the inner ring or rim B may be fastened to it. Sometimes the ring is fastened in place before the blades are assembled and sometimes it is fastened afterwards. To assemble the blades, the inner ring is held in position in anv suitable manner. A sufficient number of blades D is then mounted upon it, each lug D projecting through a perforation B The outer or upper ring C is then positioned upon the blades so that one lug D projects through each of the slots or perforations C The two rings are positioned with respect to each other so that each slot C is directly opposite a slot B and thus the longitudinal axis of each blade D is at right 'angles to the plane of the flat portion B? of the ring B. The rings and blades may be held durin assembly in any suitable fixture, arrange 'for positioning themand retaining them during assembly. The lugs D? and D serve, of course, to position the two rings with respect to each other; since they are bent into the position shown in Figure 8 before assembly they serve as stops and when is, respectively, against the lugs at the inner and outer ends of the blades D, the two rings are properly spaced with respect to each other. I

When all of the parts are in position, the lugs D and D are laterally bent as shown generally in all of the figures except 7 and 8. In that position each lug D holds a portion of the rim B of the ring B between itself and co-operating pairs of lugs D and each lug D holds a portion of the ring C between itself and co-operating pairs of lugs D Thus the rings are spaced by the blades and the thickness of the ring determines the point of bend of each lug D and D. When the lugs are so bent, they may then be secured in osition by any suitable means. As shown in ig ures 1, 3 and 5 they are soldered in position, although any other attaching means may be used. When the construction is complete each portion of each ring is not merely attached to a blade but is gripped securely between the lugs of each blade and since each end of each blade is thus in effect shaped along a flat surface, shoulders are provided on the lugs for additionally stiffening-the fan as a whole.

For some purposes it is desirable to bend the lugs D and fasten the blades at that end It is frequently found, after the blades,

have been assembled in the holding parts C and B, that the heat which has been used in fastening the blades to the holding parts,

whether they be soldered, brazed, welded or otherwise fastened, has resulted in some distortion and misalignment, particularly of the member B and its flattened portion B For this reason the annular corrugation B? is formed after the blades are assembled in the holding parts and its formation has the effect of stiffening that member as a whole. For this and other purposes, therefore, the annular corrugation B is frequently formed in the member B, B and normally is formed after the fan as a whole has been assembled but before it has been mounted on the hub. It may, of course, be omitted where it is not found necessary.

I claim:

1. A fan comprising generally oppositely spaced blade-carrying members each provided with a plurality of perforations and a plurality of blades, each end of each blade carrying lugs, one of said lugs on each end ex tending out of the plane of the blade to form a shoulder engaging oneside of each of the blade-carrying members, and another of said lugs at each end of the blade extending through one of said perforations and thence at an angle to engage opposite sides of the blade-carrying members.

2. A fan comprising a blade-carrying member provided with a perforation, a plurality of fan blades carried by said member, each blade having at its end a plurality of spaced lugs and an intermediate lug, the spaced lugs extending out of the plane of the blade to form shoulders engaging the inner face of the carrying member and the interthe opposite side of said member, and a sec- 0nd carrying member secured to the opposite ends of said blades.

3. A fan comprising generally oppositely spaced blade-carrying members each provided with a plurality of perforations, and a plurality of blades, each end of each blade carrying lugs, one of said lugs on each end extending out of the plane of the blade to form a shoulder engaging one side of each of the blade-carrying members'and another of said lugs at each end of the blade extending through one of the perforations and thence at an angle in the same direction as the first mentioned lug to engage opposite sides of the blade-carrying members.

4. A fan comprising a blade-carrying member provided with a plurality of perforations, a plurality of fan blades carried by said member, each blade having at its end a plurality of spaced lugs and an intermediate lug, the spaced lugs extending out of the plane of the blade to form shoulders engaging the nner face of the carrying member and the intermediate lug extending through one of the perforations and thence at an angle in the same du'ection as the spaced lugs to engage the opposite side of said member, and a sec- 0nd carrying member secured to the opposite ends of said blades.

5. A fan comprising generally oppositely spaced blade-carrying members provided with a plurality of perforations, one of said members being inclined with respect to the other, a plurality of blades having one end bevelled, to contact with said inclined face of the blade-carrying member, each end of each blade carrying lugs, one of said lugs on each end extending out of the plane of the blade to form a shoulder engaging one side of each of the blade-carrying members, and

another of said lugs at each end of the blade extending through one of said perforations and thence at an angle to engage opposite sides of the blade-carrying members.

6. A fan comprising generally oppositely spaced blade-carrying members provided with a plurality of perforations, one of said members being inclined with respect to the other, a plurality of blades having one end bevelled. to contact with said inclined face of the blade-carrying member, each end of each blade carrying lugs, one of said lugs on each end extending out of the plane of the blade to form a shoulder engaging one side of each of the blade-carrying members, and another of said lugs at each end of the blade extending through one of said perforations and thence at an angle in the same direction as the first mentioned lug to engage op posite sides of the blade'-carrying members.

Signed at Chicago, county of Cook and State of Illinois, this 11th day of August,

EUGENE MATHIS. 

